how to convert from int to char*?

Question

The only way I know is:

#include <sstream>
#include <string.h>
using namespace std;

int main() {
  int number=33;
  stringstream strs;
  strs << number;
  string temp_str = strs.str();
  char* char_type = (char*) temp_str.c_str();
}

But is there any method with less typing ?

Answer 1

• In C++17, use std::to_chars as:

  std::array<char, 10> str;
  std::to_chars(str.data(), str.data() + str.size(), 42);
  

• In C++11, use std::to_string as:

  std::string s = std::to_string(number);
  char const *pchar = s.c_str();  //use char const* as target type
  

• And in C++03, what you're doing is just fine, except use const as:

  char const* pchar = temp_str.c_str(); //dont use cast